Indoor drying system

Abstract

[Problem] To suppress excessive supply of heated air to a drying chamber in which laundry is hung for drying. [Solution] This indoor drying system comprises: an air conditioning device that supplies heated air to an underfloor space; a grille 30 provided on a floor 15 of a drying chamber 12; four shutters 81, 82, 83, 84 that open and close four areas 41, 42, 43, 44 of the grille 30; a weight sensor 66; and a management device. The pole 34 is provided directly above the grille 30. The weight sensor 66 detects the weight of laundry hung for drying in four laundry drying areas 51, 52, 53, 54 positioned directly above the areas 41, 42, 43, 44, respectively. The management device determines whether or not a laundry drying speed is faster than an overall average drying speed for each of the laundry drying areas 51, 52, 53, 54 on the basis of the weight of the laundry detected by the weight sensor 66. The management device changes the shutter corresponding to the laundry drying area that has been determined to have the laundry drying speed faster than the overall average drying speed from fully open to half open.

Description

TITLE OF THE INVENTION INDOOR LAUNDRY DRYING SYSTEM TECHNICAL FIELD

[0001] The present invention relates to an indoor laundry drying system that dries laundry hung in a room by an air conditioning apparatus attached to a house. BACKGROUND ART

[0002] Patent Document 1 discloses an air conditioning system of a house. The air conditioning system includes an air conditioning apparatus, a first air-conditioning duct, a second air-conditioning duct, a connection duct, and a controller. The first air-conditioning duct is connected to a powder room in which laundry is hung. The second airconditioning duct is connected to an entrance hall. The connection duct connects the first air-conditioning duct with the second air-conditioning duct. The first airconditioning duct, the second air-conditioning duct, and the connection duct are provided with valves opened and closed by the controller. Furthermore, the connection duct is provided with a blower fan controlled to drive by the controller. When determining that the laundry is hung in the powder room, the controller controls drive of the valves and the blower fan to cause dry air in the entrance hall to blow into the powder room through the connection duct.

[0003] Incidentally, there is known underfloor heating of insulating an underfloor foundation and sending heated air from an air conditioning apparatus into an underfloor space to directly warm a floor. A grille is provided in the floor of a room in the underfloor heating. The heated air in the underfloor space blows out through the grille by a pressure difference between the underfloor space and the room. PRIOR ART DOCUMENT PATENT DOCUMENT

[0004] [Patent Document 1] Japanese Laid-open Patent Publication No. 2021-32511 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0005] Since the floor is directly heated in the underfloor heating, no problems occur if a room temperature of a place where a resident is not supposed to always exist is lower by several degrees than that in a living room or the like where the resident is supposed to always exist. Sending heated air all the time into the place where the resident is not supposed to always exist lowers an energy efficiency. A powder room in which laundry is hung is a place where the resident is not supposed to always exist. In other words, sending the heated air all the time into the place where the laundry is hung lowers the energy efficiency.

[0006] On the other hand, it is necessary to send the heated air to dry the laundry. Even when sending the heated air, supplying the heated air that does not contribute to drying of the laundry is an excessive supply that lowers the energy efficiency. As the excessive supply of the heated air, supplying the heated air to laundry that has already dried or laundry that has dried to some extent are listed. For example, the laundry includes items difficult to dry, such as jeans, items easier to dry than the jeans, such as a shirt, and items further easier to dry, such as a towel and underwear. Even when the towel and the underwear dry first and the shirt or the like dries to some extent, the jeans remain wet. Supplying heated air to the towel, the underwear, the shirt, or the like in the supplied heated air is an excessive supply in this situation.

[0007] The air conditioning system described in Patent document 1 cannot suppress supplying the heated air to the laundry that has already dried or the laundry that has dried to some extent.

[0008] The present invention has been made under the abovedescribed circumstances, and an object thereof is to provide a means that can suppress an excessive supply of heated air to a room in which laundry is hung. MEANS FOR SOLVING THE PROBLEMS

[0009] (1) An indoor laundry drying system according to the present invention includes an air conditioning apparatus configured to supply heated air to an underfloor space, a grille installed in a floor of a room in which laundry is hung, a first shutter configured to open and close an opening of a first area that is one part of the grille, a second shutter configured to open and close an opening of a second area that is other part of the grille, the other part being different from the one part, a first drive device configured to cause the first shutter to open and close, a second drive device configured to cause the second shutter to open and close, a weight sensor configured to detect a first laundry weight that is a weight of the laundry hung above the first area, and a second laundry weight that is a weight of the laundry hung above the second area, and a controller.  The controller is configured to execute decision processing of deciding an opening ratio of the first area and an opening ratio of the second area based on the first laundry weight and the second laundry weight, and opening ratio change processing of causing the first drive device and the second drive device to drive based on the decided opening ratios.

[0010] A change in laundry weight with passage of time indicates drying degree of the laundry. The controller determines the drying degree of the laundry hung above the first area by the first laundry weight detected by the weight sensor. The controller determines the drying degree of the laundry hung above the second area by the second laundry weight detected by the weight sensor. For example, if the laundry hung above the first area has dried or has dried to some extent and the laundry hung above the second area remains wet, the controller executes the opening ratio change processing so that the opening ratio of the first area is decreased and the opening ratio of the second area is maintained at fully open. As a result, an excessive supply that is a supply of the heated air to the laundry that has dried or has dried to some extent can be suppressed.

[0011] (2) The grille may extend along an arrangement direction along a floor surface. The first area and the second area are aligned in the arrangement direction. The indoor laundry drying system according to the present invention further includes a pole extending in the arrangement direction. The weight sensor is a sheet-like pressure-sensitive sensor installed on the pole and extending along the arrangement direction. The pressuresensitive sensor is configured to output pressure distribution information that associates positions with detected pressures.

[0012] Since the sheet-like pressure-sensitive sensor is used as the weight sensor, the weight and the position of each laundry item can be detected respectively by the single weight sensor.

[0013] (3) The controller may be configured to obtain the first laundry weight and the second laundry weight at a predetermined sampling interval. The decision processing includes first determination processing of determining whether the laundry is hung by the weight sensor, processing of deciding the opening ratios of the first area and the second area to be both fully open, based on a determination that the laundry is hung, calculation processing of calculating, based on a fact that a weight change rate in accordance with a difference between an initial laundry total weight that is a total of an initial value of the first laundry weight and an initial value of the second laundry weight and a detected laundry total weight that is a total of the first laundry weight and the second laundry weight obtained at the predetermined sampling interval becomes equal to or larger than a predetermined threshold change rate, an overall change rate that is a change rate over time of the detected laundry total weight, a first individual change rate that is a change rate over time of the first laundry weight, and a second individual change rate that is a change rate over time of the second laundry weight, second determination processing of determining whether the first individual change rate and the second individual change rate are equal to or larger than the overall change rate, processing of deciding the opening ratio of the first area to be fully open, based on a determination that the first individual change rate is smaller than the overall change rate, processing of deciding the opening ratio of the first area to be a predetermined opening ratio smaller than fully open, based on a determination that the first individual change rate is equal to or larger than the overall change rate, processing of deciding the opening ratio of the second area to be fully open, based on a determination that the second individual change rate is smaller than the overall change rate, and processing of deciding the opening ratio of the second area to be the predetermined opening ratio, based on a determination that the second individual change rate is equal to or larger than the overall change rate.

[0014] The initial laundry total weight is a weight of the whole laundry at the time when the laundry is hung. The detected laundry total weight is a weight of the whole laundry detected periodically at the predetermined sampling interval. The predetermined threshold change rate is 10%, for example. In other words, the overall change rate, the first individual change rate, and the second individual change rate are calculated when the weight of the hung whole laundry decreases by 10%. The overall change rate is a change rate over time of the weight of the whole laundry when the weight of the whole laundry decreases by 10%. The first individual change rate is a change rate over time of the weight of the laundry hung in the first area when the weight of the whole laundry decreases by 10%. The second individual change rate is a change rate over time of the weight of the laundry hung in the second area when the weight of the whole laundry decreases by 10%. In other words, the drying degree of the laundry hung in the first area and the drying degree of the laundry hung in the second area are compared to the drying degree of the whole in the second determination processing. If the drying degree is equal to or larger than the drying degree of the whole, it indicates that the laundry dries fast as a whole. If the drying degree is smaller than the drying degree of the whole, it indicates that the laundry dries slowly as a whole. The opening ratio is decreased for the area where the laundry dries fast. The opening ratio is maintained at fully open for the area where the laundry dries slowly. In other words, the laundry that dries fast when the weight of the whole laundry decreases by 10% is caused to dry slowly after this time point. The laundry that dries slowly when the weight of the whole laundry decreases by 10% is caused to dry in the same manner after this time point. Therefore, drying completion time of the laundry in each area becomes aligned to some extent. EFFECTS OF THE INVENTION

[0015] The indoor laundry drying system according to the present invention can suppress an excessive supply of heated air to a room in which laundry is hung. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig. 1 is a schematic cross-sectional view of a house 11 to which an indoor laundry drying system 10 according to an embodiment is attached. Fig. 2 is a perspective view of a grille 30 and a pole 34 provided in a drying room 12. Fig. 3 is a configuration diagram and a function block of the indoor laundry drying system 10. Fig. 4 is an explanatory diagram for explaining a correspondence relationship among the grille 30, the pole 34, and detection positions of a weight sensor 66. Fig. 5 is a configuration diagram and a state transition diagram of a first shutter 81 and a first drive device 71, (A) shows a state in which the first shutter 81 is at a fully open position, (B) shows a state in which the first shutter 81 is at a half open position, and (C) shows a state in which the first shutter 81 is at a fully closed position. Fig. 6 is a flowchart of dry processing. MODES FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described. Note that it goes without saying that the embodiment described below is merely an example of the present invention, and the embodiment can be modified as appropriate without departing from the gist of the present invention. Furthermore, with regard to each processing (each step) shown in a flowchart of Fig. 6, an execution order may be changed as appropriate, a part may be omitted, other processing may be added, or a part may be substituted by other equivalent processing, without departing from the gist of the present invention.

[0018] [Outline of indoor laundry drying system 10] An indoor laundry drying system 10 described in the present embodiment is attached to a house 11 shown in Fig. 1. The indoor laundry drying system 10 supplies heated air to laundry hung in a drying room 12 of the house 11 to dry the laundry. Namely, the indoor laundry drying system 10 is used for indoor laundry drying in winter seasons.

[0019] [House 11] The house 11 may be a private house, or may be an apartment building. Furthermore, the house 11 may be a single-story house, or may have a plurality of floors. The house 11 shown in Fig. 1 is a private house and a singlestory house having the drying room 12, a plurality of rooms including a room 13, a corridor, an entrance hall, and the like. Note that Fig. 1 is a schematic diagram, and that illustrations of rooms except the drying room 12 and the room 13, the entrance hall, the corridor, and the like are omitted.

[0020] The drying room 12 is a powder room, for example. Namely, a room installed for a purpose different from the indoor laundry drying is used as the drying room 12. However, the drying room 12 may be provided in the house 11 as a room dedicated for the indoor laundry drying. The drying room 12 is an example of a room in which laundry is hung.

[0021] The house 11 includes an underfloor heating system 20. The underfloor heating system 20 is a system that supplies heated air to an underfloor space 16 between a heat-concealed base 14 and a floor 15 to warm the whole of the house 11 through the floor 15.

[0022] The underfloor heating system 20 has an air conditioning apparatus 21. The air conditioning apparatus 21 takes in outer air that is air outside of the house 11, warms the taken-in outer air, and sends out warmed air to the underfloor space 16 as the heated air. Furthermore, the air conditioning apparatus 21 takes in air in the house 11 and exhausts the taken-in air to an outside of the house 11. The air conditioning apparatus 21 includes a heat exchanger (not shown) and performs heat exchange between the taken-in outer air and the taken-in air from the house 11. In Fig. 1, an arrow 22 shows the outer air that the air conditioning apparatus 21 takes in. An arrow 23 shows the heated air that the air conditioning apparatus 21 sends out to the underfloor space 16. An arrow 24 shows the air in the house 11 that the air conditioning apparatus 21 takes in. As arrow 25 shows the air that the air conditioning apparatus 21 exhausts to the outside of the house 11.

[0023] Ducts 38, 39 are installed in the underfloor space 16, and one end of each of the ducts 38, 39 is connected to an outlet for the heated air of the air conditioning apparatus 21. The other end of the duct 38 is positioned under the room 13. The other end of the duct 39 is positioned under the drying room 12. The heated air that the air conditioning apparatus 21 sends out is supplied to the whole of the underfloor space 16 through the ducts 38, 39. Note that ducts other than the ducts 38, 39 may be arranged for supplying the heated air to the whole of the underfloor space 16.

[0024] The floor 15 of the house 11 includes a plurality of grilles 30. The grille 30 means a vent through which the heated air passes. The grilles 30 are provided in the floor 15 of the drying room 12, the floor 15 of the room 13, and the floor 15 of other rooms.

[0025] As shown in Fig. 2, the grille 30 includes an opening 31 provided in the floor 15, and grille members 32 arranged at the opening 31. The grille members 32 form a so-called “slatted framework”.    The grille members 32 prevent a resident from falling into the opening 31.

[0026] The grille 30 extends along an arrangement direction 33 along a floor surface that is a horizontal surface. The grille 30 extends from a neighborhood of one wall 17 of two walls that define the drying room 12 and face to each other, to a neighborhood of the other wall (not shown), for example.

[0027] The heated air that the air conditioning apparatus 21 supplies to the underfloor space 16 blows out upward through the grille 30.

[0028] A pole 34 is arranged directly above the grille 30. As shown in Fig. 1, the pole 34 is fixed to a ceiling 19 of the drying room 12. Or, the pole 34 is fixed to the wall 17 of the drying room 12. As shown in Fig. 2, the pole 34 extends along the arrangement direction 33 as with the grille 30. In the arrangement direction 33, a length of the pole 34 and a length of the grille 30 are approximately the same.

[0029] In the present embodiment, a description will be made dividing the grille 30 into four areas along the arrangement direction 33. The four areas are a first area 41, a second area 42, a third area 43, and a fourth area 44. The first area 41, the second area 42, the third area 43, and the fourth area 44 are aligned along the arrangement direction 33.

[0030] In the opening 31 of the grille 30, a part located in the first area 41 is a first opening 45, a part located in the second area 42 is a second opening 46, a part located in the third area 43 is a third opening 47, and a part located in the fourth area 44 is a fourth opening 48.

[0031] Furthermore, in the pole 34, a part located directly above the first area 41 is a first laundry drying area 51, a part located directly above the second area 42 is a second laundry drying area 52, a part located directly above the third area 43 is a third laundry drying area 53, and a part located directly above the fourth area 44 is a fourth laundry drying area 54.

[0032] [Indoor laundry drying system 10] The indoor laundry drying system 10 is a system that uses the air conditioning apparatus 21 and the grille 30 attached to the house 11. In addition to the air conditioning apparatus 21 and the grille 30, the indoor laundry drying system 10 includes a management device 60, a weight sensor 66, a group of drive devices 70, and a group of shutters 80 shown in Fig. 3, and a support mechanism 90 shown in Fig. 5.

[0033] As show in Fig. 2, the weight sensor 66 is attached to the pole 34. The weight sensor 66 is a sheet-like pressure sensor. The weight sensor 66 has a band shape extending along the arrangement direction 33. The weight sensor 66 spans from one end portion to the other end portion of the pole 34 in the arrangement direction 33. The weight sensor 66 outputs detection information that associates position information indicating positions to where pressure is applied with pressure information indicating the applied pressure. The position information is distance information taking one end of the pole 34 in the arrangement direction 33 as an origin, for example. The distance information indicates a distance from the origin to a position where the pressure is detected.

[0034] The weight sensor 66 can detect a weight of the laundry hung in the first laundry drying area 51 of the pole 34, a weight of the laundry hung in the second laundry drying area 52, a weight of the laundry hung in the third laundry drying area 53, and a weight of the laundry hung in the fourth laundry drying area 54 individually. Furthermore, the weight sensor 66 outputs the detection information periodically at a predetermined sampling interval. The predetermined sampling interval is from several ten milliseconds to several hundred milliseconds, for example.

[0035] The “weight of the laundry hung in the first laundry drying area 51” detected by the weight sensor 66 is a first laundry weight. The “weight of the laundry hung in the second laundry drying area 52” detected by the weight sensor 66 is a second laundry weight. The “weight of the laundry hung in the third laundry drying area 53” detected by the weight sensor 66 is a third laundry weight. The “weight of laundry hung in the fourth laundry drying area 54” detected by the weight sensor 66 is a fourth laundry weight.

[0036] Fig. 4 shows a correspondence relationship among the first area 41, the first laundry drying area 51, and the first laundry weight. Furthermore, Fig. 4 shows a correspondence relationship among the second area 42, the second laundry drying area 52, and the second laundry weight. Furthermore, Fig. 4 shows a correspondence relationship among the third area 43, the third laundry drying area 53, and the third laundry weight. Furthermore, Fig. 4 shows a correspondence relationship among the fourth area 44, the fourth laundry drying area 54, and the fourth laundry weight. In Fig. 4, five towels 26 are hung in the first laundry drying area 51, four shirts 27 are hung in the second laundry drying area 52, three sweaters 28 are hung in the third laundry drying area 53, and three pairs of jeans 29 are hung in the fourth laundry drying area 54. “X5” shown in Fig. 4 shows that the five towels 26 are hung, “X4” shows that the four shirts 27 are hung, and “X3” shows that the three sweaters 28 and the three pairs of jeans 29 are hung.

[0037] The detection information that the weight sensor 66 outputs is converted into a digital signal by a conversion IC not shown. The digital signal is a rectangular wave having an intensity in accordance with a detected pressure, namely, the weight of the laundry.

[0038] The first laundry weight is a total value of the weight of the laundry hung in the first laundry drying area 51. In the example shown in Fig. 4, the first laundry weight is a total value of intensities of five rectangular waves 101 detected in the first laundry drying area 51.

[0039] The second laundry weight is a total value of the weight of the laundry hung in the second laundry drying area 52. In the example shown in Fig. 4, the second laundry weight is a total value of intensities of four rectangular waves 102 detected in the second laundry drying area 52.

[0040] The third laundry weight is a total value of the weight of the laundry hung in the third laundry drying area 53. In the example shown in Fig. 4, the third laundry weight is a total value of intensities of four rectangular waves 103 detected in the third laundry drying area 53.

[0041] The fourth laundry weight is a total value of the weight of the laundry hung in the fourth laundry drying area 54. In the example shown in Fig. 4, the fourth laundry weight is a total value of intensities of three rectangular waves 104 detected in the fourth laundry drying area 54.

[0042] Note that the laundry hung in each of the laundry drying areas 51, 52, 53, 54 may not necessarily be divided by kinds of clothes as shown in Fig. 4. Clothes of different kinds, such as the towel 26, the shirt 27, the sweater 28, and the jeans 29 may be hung in a mixed manner in each of the laundry drying areas 51, 52, 53, 54 respectively, for example. Note that the resident may be recommended to hang the laundry, dividing by the kinds of the clothes.

[0043] The weight sensor 66 is communicably connected with the management device 60 or a router (not shown) installed in the house 11 by a communication cable or wireless communication.

[0044] As shown in Fig. 3, the group of drive devices 70 includes a first drive device 71, a second drive device 72, a third drive device 73, and a fourth drive device 74.

[0045] The first drive device 71, the second drive device 72, the third drive device 73, and the fourth drive device 74 have the same configuration except installation locations.

[0046] As shown in Figs. 3 and 5, the first drive device 71 includes a first motor 75, an interlocking gear 58, a speed reduction gear mechanism 59, and a power supply device 79. The second drive device 72 includes a second motor 76, the interlocking gear 58, the speed reduction gear mechanism 59, and the power supply device 79. The third drive device 73 includes a third motor 77, the interlocking gear 58, the speed reduction gear mechanism 59, and the power supply device 79. The fourth drive device 74 includes a fourth motor 78, the interlocking gear 58, the speed reduction gear mechanism 59, and the power supply device 79.    The interlocking gear 58 included in the first drive device 71, the interlocking gear 58 included in the second drive device 72, the interlocking gear 58 included in the third drive device 73, and the interlocking gear 58 included in the fourth drive device 74 are different members. Furthermore, the speed reduction gear mechanism 59 included in the first drive device 71, the speed reduction gear mechanism 59 included in the second drive device 72, the speed reduction gear mechanism 59 included in the third drive device 73, and the speed reduction gear mechanism 59 included in the fourth drive device 74 are different members. Furthermore, the power supply device 79 is shared by the second drive device 72, the third drive device 73, and the fourth drive device 74.

[0047] The four motors 75, 76, 77, 78 are stepping motors whose rotation amounts are controllable, for example. The motors 75, 76, 77, 78 are driven by supplying three-phase alternating-current voltages. As shown in Fig. 5(A), each of the motors 75, 76, 77, 78 has a rotation shaft 56 that rotates by driving. The rotation shaft 56 is connected to the speed reduction gear mechanism 59.

[0048] The speed reduction gear mechanism 59 is a mechanism that reduces rotation of the rotation shaft 56 to output the reduced rotation. The speed reduction gear mechanism 59 is fixed to the floor 15 directly or via the support mechanism 90. The speed reduction gear mechanism 59 has an output gear 57. The output gear 57 works with the rotation of the rotation shaft 56 to rotate slower than the rotation shaft 56. The output gear 57 meshes with the interlocking gear 58. A commercial speed reduction gear box is used as the speed reduction gear mechanism 59, for example.

[0049] The interlocking gear 58 is fixed to the floor 15 directly or via the support mechanism 90, and meshes with the output gear 57. Furthermore, the interlocking gear 58 meshes with a rack gear 85 of one of shutters 81, 82, 83, 84, respectively. The interlocking gear 58 transmits rotation of the output gear 57 to one of the shutters 81, 82, 83, 84, and causes one of the shutters 81, 82, 83, 84 to slide.

[0050] The power supply device 79 shown in Fig. 3 is connected to a commercial alternating voltage attached to the house 11. The power supply device 79 converts an input alternating-current voltage to a three-phase alternating-current voltage and outputs the converted voltage. The power supply device 79 includes a convertor that converts the input alternating-current voltage to a direct-current voltage, and an inverter that converts the converted direct-current voltage to the three-phase alternating-current voltage, for example.

[0051] The power supply device 79 has four output terminals. A first output terminal is connected to the first motor 75. A second output terminal is connected to the second motor 76. A third output terminal is connected to the third motor 77. A fourth output terminal is connected to the fourth motor 78. Namely, the power supply device 79 can drive the motors 75, 76, 77, 78 individually. The power supply device 79 is controlled to drive by the management device 60. Namely, the management device 60 can individually drive the first drive device 71, the second drive device 72, the third drive device 73, and the fourth drive device 74 via the power supply device 79.

[0052] As shown in Fig. 3, the group of shutters 80 includes a first shutter 81, a second shutter 82, a third shutter 83, and a fourth shutter 84. Each of the four shutters 81, 82, 83, 84 includes the rack gear 85 on a lower surface. The rack gear 85 extends along a slide direction 35. The slide direction 35 is a direction that is along the horizontal direction and is perpendicular to the arrangement direction 33.

[0053] The first shutter 81 shown in Fig. 5 is slidably supported by a first support mechanism 90, and is slid by the first drive device 71. The second shutter 82 is slidably supported by a second support mechanism 90, and is slid by the second drive device 72. The third shutter 83 is slidably supported by a third support mechanism 90, and is slid by the third drive device 73. The fourth shutter 84 is slidably supported by a fourth support mechanism 90, and is slid by the fourth drive device 74.

[0054] The first shutter 81, the second shutter 82, the third shutter 83, and the fourth shutter 84 have the same configuration. Furthermore, the four support mechanisms 90 have the same configuration. In the following, the first shutter 81 and the first support mechanism 90 will be described.

[0055] The support mechanism 90 includes a pair of guide rails 91 and a pair of positioning members 92, 93 that are fixed at a lower surface of the floor 15 of the drying room 12.

[0056] One guide rail 91 fits to one end portion of the first shutter 81 in the arrangement direction 33. The other guide rail 91 fits to the other end portion of the first shutter 81 in the arrangement direction 33. The pair of guide rails 91 supports the first shutter 81 slidably along the slide direction 35.

[0057] The positioning members 92, 93 are fixed to the floor 15 directly or via the support mechanism 90. One positioning member 92 is arranged at a position where the first shutter 81 that slides from a fully closed position to a fully open position along the slide direction 35 abuts. The other positioning member 93 is arranged at a position where the first shutter 81 that slides from the fully open position to the fully closed position along the slide direction 35 abuts. The positioning member 92 restricts the first shutter 81 to slide over the fully open position, and fixes the position of the first shutter 81 at the fully open position. The positioning member 93 restricts the first shutter 81 to slide over the fully closed position, and fixes the position of the first shutter 81 at the fully closed position.

[0058] The first drive device 71 and the first shutter 81 are installed under the first area 41 of the grille 30. The first shutter 81 is slid by the first drive device 71, and causes the first opening 45 of the grille 30 to open and close. Specifically, the first shutter 81 is slid among a fully open position shown in Fig. 5(A) where the first opening 45 of the grille 30 is fully open, a half open position shown in Fig. 5(B) where the first opening 45 is half open, and a fully closed position shown in Fig. 5(C) where the first opening 45 is fully closed. An opening ratio of the first opening 45 at the fully open position is 100%. The opening ratio of the first opening 45 at the half open position is 50%. The opening ratio of the first opening 45 at the fully closed position is 0%.

[0059] The second drive device 72 and the second shutter 82 are installed under the second area 42 of the grille 30. The second shutter 82 is slid by the second drive device 72, and causes the second opening 46 of the grille 30 to open and close. The second shutter 82 is slid among a fully open position where the second opening 46 of the grille 30 is fully open, a half open position where the second opening 46 is half open, and a fully closed position where the second opening 46 is fully closed.

[0060] The third drive device 73 and the third shutter 83 are installed under the third area 43 of the grille 30. The third shutter 83 is slid by the third drive device 73, and causes the third opening 47 of the grille 30 to open and close. The third shutter 83 is slid among a fully open position where the third opening 47 of the grille 30 is fully open, a half open position where the third opening 47 is half open, and a fully closed position where the third opening 47 is fully closed.

[0061] The fourth drive device 74 and the fourth shutter 84 are installed under the fourth area 44 of the grille 30. The fourth shutter 84 is slid by the fourth drive device 74, and causes the fourth opening 48 of the grille 30 to open and close. The fourth shutter 84 is slid among a fully open position where the fourth opening 48 of the grille 30 is fully open, a half open position where the fourth opening 48 is half open, and a fully closed position where the fourth opening 48 is fully closed.

[0062] The management device 60 shown in Fig. 3 is a personal computer installed in the house 11. Or, the management device 60 is a management terminal for house management on which a microcomputer is installed.

[0063] The management device 60 includes a CPU 61 that is a central processing unit, a memory 62, and a communication interface 63. The CPU 61 is connected to the memory 62 and the communication interface 63 by a communication bus not shown. The CPU 61 is an example of a controller.

[0064] The communication interface 63 is connected to the weight sensor 66 and the power supply device 79 via the router installed in the house 11, for example. The router, the management device 60, the weight sensor 66, and the power supply device 79 are connected by the communication cable or by short-range wireless communication, such as Wi-Fi.

[0065] The memory 62 is a ROM, a RAM, an EEPROM, a hard disk drive, a solid state drive, a USB memory, or the like, for example. The memory 62 may have other memory elements.

[0066] The memory 62 stores an OS 64 that is an operating system, a management program 65, and various threshold values.

[0067] The management program 65 controls opening and closing of the group of shutters 80 via the power supply device 79 based on the laundry weights detected by the weight sensor 66.    Hereinafter, a detailed description will be made referring to Fig. 6.    Note that processing that the management program 65 causes the CPU 61 to execute is processing that the CPU 61 that is a controller executes, and is processing that the management device 60 executes.

[0068] [Processing of management program 65] As shown in Fig. 6, the management program 65 obtains the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight based on the detection information of the weight sensor 66  (S11). The management program 65 determines whether laundry is hung in the drying room 12 based on each laundry weight (S12). Specifically, the management program 65 determines whether any one of the laundry weights among the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight is equal to or larger than a threshold weight. Or, the management program 65 determines whether a laundry total weight that is a total of the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight is equal to or larger than a threshold weight. When each laundry weight or the laundry total weight is equal to or larger than the threshold weight, the management program 65 determines that the laundry is hung (S12: Yes). The threshold weight is a threshold value prestored in the memory 62, and is a weight corresponding to a weight of the lightest laundry item immediately after washing, such as a towel and underwear, for example. The processing of step S12 is an example of first determination processing.

[0069] When determining that the laundry is not hung (S12: No), the management program 65 finishes dry processing (END). The management program 65 repeatedly executes the processing of steps S11 and S12 at a predetermined interval. The predetermined interval is from several hundred milliseconds to several seconds, for example.

[0070] When determining that the laundry is hung (S12: Yes), the management program 65 calculates a laundry total weight that is the total of the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight, and causes the memory 62 to store the laundry total weight as an initial laundry total weight Wa (S13). Furthermore, the management program 65 causes the memory 62 to store the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight (S13).

[0071] Next, the management program 65 decides the opening ratios of all the shutters 81, 82, 83, 84 to be 100% that is fully open, and causes the group of drive devices 70 to drive (S14). For example, the management program 65 drives the motors 75,  76,  77,  78 for a time or rotation amount sufficient for the shutters 81, 82, 83, 84 slide to the fully open positions where they abut the positioning member 92. The processing of step S14 is an example of processing of deciding to be fully open.

[0072] By setting all the shutters 81, 82, 83, 84 to fully open, the heated air blows out upward from the first opening 45, the second opening 46, the third opening 47, and the fourth opening 48 of the grille 30. The laundry dries gradually by the heated air. Namely, the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight detected by the weight sensor 66 decrease gradually.

[0073] The management program 65 obtains again the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight that decrease gradually, and causes the memory 62 to store the weights (S15). The management program 65 sums up the obtained laundry weights to calculate a detected laundry total weight Wb (S16). The management program 65 divides a difference between the initial laundry total weight Wa stored in the memory 62 in step S13 and the detected laundry total weight Wb calculated in step S16 by the initial laundry total weight Wa to calculate a weight change rate A of the laundry total weight (S17). Note that the difference is obtained as a positive value by taking an absolute value. Or, the difference is obtained as the positive value by subtracting the detected laundry total weight Wb from the initial laundry total weight Wa.

[0074] The management program 65 determines whether the weight change rate A of the laundry total weight is equal to or larger than a first threshold change rate prestored in the memory 62 (S18). The first threshold change rate is 10%, for example. Namely, it is determined in step S18 whether the laundry total weight including water immediately after washing is decreased by 10%. The first threshold change rate may be another value, such as 20% or 30%, in place of 10%.

[0075] When determining that the weight change rate A is smaller than the first threshold change rate (S18: No), the management program 65 executes the processing of steps S15 to S18 again. Namely, detection of the laundry weight is repeated until the laundry becomes 10% lighter in weight ratio. The processing of steps S15 to S18 is repeatedly executed in a predetermined sampling interval, for example. The predetermined sampling interval is from several ten milliseconds to several hundred milliseconds, for example.

[0076] When determining that the weight change rate A is equal to or larger than the first threshold change rate (S18: Yes), the management program 65 obtains again the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight, and causes the memory 62 to store the weights (S19).

[0077] The management program 65 sums up the obtained laundry weights to calculate a detected laundry total weight Wc (S20). The management program 65 divides a difference between the initial laundry total weight Wa stored in the memory 62 in step S13 and the detected laundry total weight Wc calculated in step S16 by time to reach T to calculate an overall change rate D that is a change rate over time of the detected laundry total weight Wc (S20). The time to reach time is a time from a timing when the laundry weight is obtained in step S11 to a timing when the laundry weight is obtained in S19. For example, the time to reach T is calculated by multiplying the above-described sampling interval with a number of detection of the laundry weight obtained and stored in the memory 62 in steps S15 and S19. The management program 65 causes the memory 62 to store the calculated overall change rate D (S20). The overall change rate D is an average of drying speed of the whole laundry. The drying speed indicates drying degree of the laundry as the whole laundry.

[0078] Furthermore, the management program 65 calculates individual change rates dn including an individual change rate d1 that is a change rate over time of the first laundry weight, an individual change rate d2 that is a change rate over time of the second laundry weight, an individual change rate d3 that is a change rate over time of the third laundry weight, and an individual change rate d4 that is a change rate over time of the fourth laundry weight, based on each laundry weight stored in the memory 62 in step S13 and each laundry weight obtained in S19 (S21). Specifically, the management program 65 divides a difference between the first laundry weight stored in the memory 62 in step S13 and the first laundry weight obtained in step S19 by the abovedescribed time to reach T to calculate the individual change rate d1 of the first laundry weight. The management program 65 calculates the individual change rate d2 of the second laundry weight, the individual change rate d3 of the third laundry weight, and the individual change rate d4 of the fourth laundry weight, as with the individual change rate d1 of the first laundry weight. “d1” is an example of a first individual change rate. “d2” is an example of a second individual change rate. The processing of step S20 and S21 is an example of calculation processing.

[0079] The individual change rate d1 of the first laundry weight indicates an average drying speed that is an average of drying speed of the laundry hung in the first laundry drying area 51 of the pole 34. The individual change rate d2 of the second laundry weight indicates an average drying speed that is an average of drying speed of the laundry hung in the second laundry drying area 52 of the pole 34. The individual change rate d3 of the third laundry weight indicates an average drying speed that is an average of drying speed of the laundry hung in the third laundry drying area 53 of the pole 34. The individual change rate d4 of the fourth laundry weight indicates an average drying speed that is an average of drying speed of the laundry hung in the fourth laundry drying area 54 of the pole 34. The average drying speed indicates drying degree of the laundry in each of the laundry drying areas 51, 52, 53, 54.

[0080] The management program 65 determines whether each of the individual change rates d1, d2, d3, d4 is equal to or larger than the overall change rate D that is the change rate over time of the laundry total weight (S22). Namely, it is determined in step S22 whether the individual change rate d1 indicating the average drying speed of the laundry hung in the first laundry drying area 51 of the pole 34 is equal to or larger than the overall change rate D, whether the individual change rate d2 indicating the average drying speed of the laundry hung in the second laundry drying area 52 is equal to or larger than the overall change rate D, whether the individual change rate d3 indicating the average drying speed of the laundry hung in the third laundry drying area 53 is equal to or larger than the overall change rate D, and whether the individual change rate d4 indicating the average drying speed of the laundry hung in the fourth laundry drying area 54 is equal to or larger than the overall change rate D. The processing of step S22 is an example of second determination processing.

[0081] When determining that the individual change rate d1 is smaller than the overall change rate D (S22: No), the management program 65 decides to maintain the opening ratio of the first shutter 81 at 100% that is fully open (S23). When determining that the individual change rate d1 is equal to or larger than the overall change rate D (S22: Yes), the management program 65 decides to change the opening ratio of the first shutter 81 to 50% that is half open (S24). The management program 65 similarly decides the opening ratio of the second shutter 82, the opening ratio of the third shutter 83, and the opening ratio of the fourth shutter 84  (S23, S24). Note that if there is an area in which the laundry is not hung among the four laundry drying areas 51, 52, 53, 54, the opening ratio of the shutter corresponding to the area is decided to be half open, irrespective of the individual change rate dn. The opening ratio of 50% that is half open is an example of a predetermined opening ratio smaller than fully open. The processing of step S24 is an example of processing of deciding to be a predetermined opening ratio smaller than fully open. The predetermined opening ratio smaller than fully open may be other values, such as 40%, 30%, 60%, or 70%, in place of 50%.

[0082] The management program 65 causes the group of drive devices 70 to drive based on the decided opening ratios (S25), namely, changes some shutters among the shutters 81, 82, 83, 84 to half open, and maintains the remaining shutters at fully open.   In this manner, the management program 65 changes the shutter corresponding to the area where the laundry dries earlier than the average drying speed of the whole laundry from fully open to half open at the timing when the laundry total weight is decreased by 10%. For example, if the drying speed of the laundry hung in the first laundry drying area 51, the second laundry drying area 52, and the third laundry drying area 53 of the pole 34 is faster than the average drying speed and the drying speed of the laundry hung in the fourth laundry drying area 54 is slower than the average drying speed, the first shutter 81, the second shutter 82, and the third shutter 83 are changed to half open, and the fourth shutter 84 is maintained at fully open.

[0083] After maintaining open / close ratios of the shutters 81, 82, 83, 84 at fully open or changing them to half open (S25), the management program 65 obtains again the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight, and causes the memory 62 to store the weights (S26). The management program 65 sums up each of the obtained laundry weights to calculate a detected laundry total weight Wd (S27). The management program 65 divides a difference between the initial laundry total weight Wa stored in the memory 62 in step S13 and the detected laundry total weight Wd calculated in step S27 by the initial laundry total weight Wa to calculate a weight change rate B of the laundry total weight (S28).   The management program 65 determines whether the calculated weight change rate B of the laundry total weight is equal to or larger than a second threshold change rate prestored in the memory 62  (S28). The second threshold change rate is 80% that corresponds to 20% that is a water containing ratio of clothes when the laundry has dried.   Namely, it is determined in step S28 whether all the laundry has dried.

[0084] When determining that the weight change rate B of the laundry total weight is smaller than the second threshold change rate prestored in the memory 62 (S28: No), the management program 65 executes the processing of steps S26, S27, and S28 again. Namely, detection of the laundry weight is repeated until drying of the laundry is completed. The processing of steps S26, S27, and S28 is repeatedly executed by a predetermined sampling interval, for example. The predetermined sampling interval is from several ten milliseconds to several hundred milliseconds, for example.

[0085] When determining that the weight change rate B of the laundry total weight is equal to or larger than the second threshold change rate (S28: Yes), the management program 65 decides all the shutters 81, 82, 83, 84 to be fully closed (S29). The processing of step S14, S23, S24, and S29 of deciding the opening ratios of the shutters 81, 82, 83, 84 is an example of decision processing.

[0086] The management program 65 causes the group of drive devices 70 to drive via the power supply device 79 to change all the shutters 81, 82, 83, 84 to fully closed (S30). Namely, when determining all the laundry has dried (S28: Yes), the management program 65 closes all the shutters 81, 82, 83, 84. The management program 65 causes the motors 75, 76, 77, 78 to drive for a time or rotation amount sufficient for the shutters 81, 82, 83, 84 slide to the fully closed positions where they abut the positioning member 93, for example. The processing of steps S14, S25, S30 of causing the group of drive devices 70 to drive to change the open / close ratios of the shutters 81,  82,  83,  84 is an example of opening ratio change processing.

[0087] The management program 65 notifies to the resident that the drying of the laundry is completed (S31), and finishes the dry processing (END). The notification to the resident is performed by causing a speaker installed in the house 11 to output an alarm sound or by sending notification information to a communication terminal possessed by the resident, for example.

[0088] [Actions and effects of embodiment] Among the shutters 81,  82,  83,  84, the management program 65 changes the shutters corresponding to the laundry drying areas 51, 52, 53, 54 whose drying speed is faster than the average drying speed from fully open to half open at the timing when the laundry weight changes by 10%. Namely, the management program 65 changes the shutters from fully open to half open for the laundry drying areas in which many clothes of kinds that dry easily are hung at a predetermined timing. Therefore, an excessive supply that is a supply of the heated air to the laundry for which the drying is completed is suppressed, compared with a case in which all the shutters 81, 82, 83, 84 are fully open until the laundry dries.

[0089] Since the sheet-like pressure-sensitive sensor is used as the weight sensor 66, the weight of the laundry hang in each of the laundry drying areas 51, 52, 53, 54 can be detected respectively by the single weight sensor 66.

[0090] Among the shutters 81, 82, 83, 84, the management program 65 changes the shutter corresponding to the laundry drying areas 51, 52, 53, 54 whose drying speed is faster than the average drying speed from fully open to half open at the timing when the laundry weight changes by 10%. Therefore, in each of the laundry drying areas 51, 52, 53, 54, the timing when the drying of the laundry is completed becomes aligned compared with the case where all the shutters 81, 82, 83, 84 are fully open until the laundry dries. As a result, the resident is suppressed from taking in the laundry for which the drying is not completed together with the laundry for which the drying is completed.

[0091] [Modification examples] In the embodiment, described is an example in which the shutter corresponding to the laundry drying area whose drying speed is faster than the average drying speed of the whole laundry is changed from fully open to half open at the timing when the initial laundry weight decreases by 10%. However, the shutters corresponding to the drying areas may be changed from fully open to half open in order from the areas having faster drying speeds. The timing when the shutter is changed from fully open to half open is, for example, the timing when the weight change rate of the weight of the laundry hung in each laundry drying area becomes a predetermined value. For example, the towels hung in the first laundry drying area 51 dry faster than the laundry hung in other areas, and the first shutter 81 is changed from fully open to half open at the timing when the weight change rate of the towels 26 becomes 50%. The shirts 27 hung in the second laundry drying area 52 dry faster than the laundry hung in the third laundry drying area 53 and the fourth laundry drying area 54, and the second shutter 82 is changed from fully open to half open at the timing when the weight change rate of the shirts 27 becomes 50%. The sweaters hung in the third laundry drying area 53 dry faster than the jeans 29 hung in the fourth laundry drying area 54, and the third shutter 83 is changed from fully open to half open at the timing when the weight change rate of the sweaters 28 becomes 50%. “50%” is a threshold value for deciding the timing of changing the opening ratio of the shutter. The threshold value may be other values, such as 30%, 40%, 60%, or 70%. The management program 65 may control drive of the group of drive devices 70 by any processing, as long as the area in which the laundry that dries fast is hung is determined based on the detected laundry weight, and the shutter corresponding to the area in which the laundry that dries fast is changed from fully open to an opening ratio smaller than fully open in the course of drying in this manner.

[0092] In the embodiment, the detected laundry total weight Wd is calculated in step S27, and it is determined in step S28 whether the weight change rate B of the laundry total weight is equal to or larger than the second threshold change rate. However, in step S27, a weight change rate C1 of the first laundry weight may be calculated by dividing a difference between the first laundry weight obtained in step S11 and the laundry weight obtained in step S26 with the first laundry weight obtained in step S11. A weight change rate C2 of the second laundry weight, a weight change rate C3 of the third laundry weight, and a weight change rate C4 of the fourth laundry weight are calculated similarly. In step S28, it is determined whether all the weight change rates C1, C2, C3, and C4 of the laundry weight are equal to or larger than the second threshold change rate. Namely, whether the laundry dries may be determined for each of the laundry drying areas 51, 52, 53, 54, not for the whole laundry.

[0093] In the embodiment, described is an example in which the individual change rate dn of the laundry weight indicating the average drying speed of the laundry hung in the laundry drying areas 51, 52, 53, 54 of the pole 34 and the overall change rate D indicating the average drying speed of the whole laundry are compared in step S22. However, the laundry having the slowest drying speed may be specified among the laundry hung in the laundry drying areas 51, 52, 53, 54, and the drying speed of the specified laundry and the overall change rate D may be compared. Namely, the shutters 81, 82, 83, 84 may be opened or closed taking as a reference the drying speed of the laundry most unlikely to dry in the laundry drying areas 51, 52, 53, 54, not the “average” of the drying speeds.

[0094] In the embodiment, described is an example in which the sheet-like pressure sensor that can detect the first laundry weight, the second laundry weight, the third laundry weight, and the fourth laundry weight is used as the weight sensor 66. However, four weight sensors, that is, a first weight sensor that detects the first laundry weight, a second weight sensor that detects the second laundry weight, a third weight sensor that detects the third laundry weight, and a fourth weight sensor that detects the fourth laundry weight, may be installed on the pole 34. The first weight sensor is arranged in the first laundry drying area 51. The second weight sensor is arranged in the second laundry drying area 52. The third weight sensor is arranged in the third laundry drying area 53. The fourth weight sensor is arranged in the fourth laundry drying area 54.

[0095] In the embodiment, described is an example in which the indoor laundry drying system 10 includes the four drive devices 71, 72, 73, 74 and the four shutters 81, 82, 83, 84. However, the indoor laundry drying system 10 may include two drive devices 71, 72 and two shutters 81 82, may include three drive devices 71, 72, 73 and three shutters 81, 82, 83, or may include five or more drive devices and five or more shutters.

[0096] In the embodiment, described is an example in which the support mechanism 90 includes the pair of guide rails 91. However, the support mechanism 90 may have any mechanism as long as it can slidably support one of the shutters 81, 82, 83, 84. The support mechanism 90 may include one pair of guide pins penetrated through one of the shutters 81, 82, 83, 84 in place of the pair of guide rails 91, for example.

[0097] In the embodiment, described is an example in which the indoor laundry drying system 10 includes the first motor 75, the second motor 76, the third motor 77, and the fourth motor 78 that are stepping motors. However, the indoor laundry drying system 10 may include a first electric cylinder, a second electric cylinder, a third electric cylinder, and a fourth electric cylinder in place of the first motor 75, the second motor 76, the third motor 77, and the fourth motor 78. The first shutter 81 is fixed to a tip end of a rod of the first electric cylinder. The second shutter 82 is fixed to a tip end of a rod of the second electric cylinder. The third shutter 83 is fixed to a tip end of a rod of the third electric cylinder. The fourth shutter 84 is fixed to a tip end of a rod of the fourth electric cylinder. Slide amounts of the rods of the first electric cylinder, the second electric cylinder, the third electric cylinder, and the fourth electric cylinder are controlled by the management device 60. The management device 60 controls opening and closing of the shutters 81, 82,  83,  84 via the power supply device 79 and the four electric cylinders.

[0098] In the embodiment, described is an example in which the laundry is hung in the four laundry drying areas 51, 52, 53, 54, and all the shutters 81, 82, 83, 84 are set to fully open in step S14. The management program 65 may determine whether there is an area in which the laundry is not hung among the four laundry drying areas 51, 52, 53, 54, based on each laundry weight stored in the memory 62 in step S13. The management program 65 may set the shutter corresponding to the area in which the laundry is not hung to fully closed or half open in step S14. Or, the management program 65 may set the shutter to half open for the area in which the laundry is not hung in steps S24 and S25.

[0099] [Additional note 1] An indoor laundry drying system comprising: an air conditioning apparatus configured to supply heated air to an underfloor space; a grille installed in a floor of a room in which laundry is hung; a first shutter configured to open and close an opening of a first area that is one part of the grille; a second shutter configured to open and close an opening of a second area that is other part of the grille, the other part being different from the one part; a first drive device configured to cause the first shutter to open and close; a second drive device configured to cause the second shutter to open and close; a weight sensor configured to detect a first laundry weight that is a weight of the laundry hung above the first area, and a second laundry weight that is a weight of the laundry hung above the second area; and a controller, wherein the controller is configured to execute: decision processing of deciding an opening ratio of the first area and an opening ratio of the second area based on the first laundry weight and the second laundry weight; and opening ratio change processing of causing the first drive device and the second drive device to drive based on the decided opening ratios.

[0100] [Additional note 2] The indoor laundry drying system according to additional note 1, wherein the grille extends along an arrangement direction along a floor surface, the first area and the second area are aligned in the arrangement direction, the indoor laundry drying system further comprises a pole extending in the arrangement direction, the weight sensor is a sheet-like pressure-sensitive sensor installed on the pole and extending along the arrangement direction, and the pressure-sensitive sensor is configured to output pressure distribution information that associates positions with detected pressures.

[0101] [Additional note 3] The indoor laundry drying system according to additional note 1, wherein the controller is configured to obtain the first laundry weight and the second laundry weight at a predetermined sampling interval, and the decision processing includes: first determination processing of determining whether the laundry is hung by the weight sensor; processing of deciding the opening ratios of the first area and the second area to be both fully open, based on a determination that the laundry is hung; calculation processing of calculating, based on a fact that a weight change rate in accordance with a difference between an initial laundry total weight that is a total of an initial value of the first laundry weight and an initial value of the second laundry weight and a detected laundry total weight that is a total of the first laundry weight and the second laundry weight obtained at the predetermined sampling interval becomes equal to or larger than a predetermined threshold change rate, an overall change rate that is a change rate over time of the detected laundry total weight, a first individual change rate that is a change rate over time of the first laundry weight, and a second individual change rate that is a change rate over time of the second laundry weight; second determination processing of determining whether the first individual change rate and the second individual change rate are equal to or larger than the overall change rate; processing of deciding the opening ratio of the first area to be fully open, based on a determination that the first individual change rate is smaller than the overall change rate; processing of deciding the opening ratio of the first area to be a predetermined opening ratio smaller than fully open, based on a determination that the first individual change rate is equal to or larger than the overall change rate; processing of deciding the opening ratio of the second area to be fully open, based on a determination that the second individual change rate is smaller than the overall change rate; and processing of deciding the opening ratio of the second area to be the predetermined opening ratio, based on a determination that the second individual change rate is equal to or larger than the overall change rate. DESCRIPTION OF REFERENCE CHARACTERS

[0102] 10:    indoor laundry drying system 11:    house 12:    drying room 15:    floor 16:    underfloor space 21:    air conditioning apparatus 30:    grille opening arrangement direction pole slide direction first area second area third area fourth area first opening second opening third opening fourth opening first laundry drying area second laundry drying area third laundry drying area fourth laundry drying area management device CPU (controller) memory management program weight sensor first drive device second drive device third drive device fourth drive device first shutter second shutter 83: third shutter 84:    fourth shutter 90:    support mechanism

Claims

1. An indoor laundry drying system comprising:an air conditioning apparatus configured to supply heated air to an underfloor space;a grille installed in a floor of a room in which laundry is hung;a first shutter configured to open and close an opening of a first area that is one part of the grille;a second shutter configured to open and close an opening of a second area that is other part of the grille, the other part being different from the one part;a first drive device configured to cause the first shutter to open and close;a second drive device configured to cause the secondshutter to open and close;a weight sensor configured to detect a first laundryweight that is a weight of the laundry hung above the first area, and a second laundry weight that is a weight of the laundry hung above the second area; anda controller, whereinthe controller is configured to execute:decision processing of deciding an opening ratio of the first area and an opening ratio of the second area based on the first laundry weight and the second laundry weight; andopening ratio change processing of causing the first drive device and the second drive device to drive based onthe decided opening ratios.

2. The indoor laundry drying system according to claim 1, whereinthe grille extends along an arrangement direction along a floor surface,the first area and the second area are aligned in the arrangement direction,the indoor laundry drying system further comprises apole extending in the arrangement direction,the weight sensor is a sheet-like pressure-sensitive sensor installed on the pole and extending along the arrangement direction, andthe pressure-sensitive sensor is configured to output pressure distribution information that associates positions with detected pressures.

3. The indoor laundry drying system according to claim 1, whereinthe controller is configured to obtain the first laundry weight and the second laundry weight at a predetermined sampling interval, andthe decision processing includes:first determination processing of determining whether the laundry is hung by the weight sensor;processing of deciding the opening ratios of the first area and the second area to be both fully open, based on adetermination that the laundry is hung;calculation processing of calculating, based on a fact that a weight change rate in accordance with a difference between an initial laundry total weight that is a total of an initial value of the first laundry weight and an initial value of the second laundry weight and a detected laundry total weight that is a total of the first laundry weight and the second laundry weight obtained at the predetermined sampling interval becomes equal to or larger than a predetermined threshold change rate, an overall change rate that is a change rate over time of the detected laundry total weight, a first individual change rate that is a change rate over time of the first laundry weight, and a second individual change rate that is a change rate over time of the second laundry weight;second determination processing of determining whether the first individual change rate and the second individual change rate are equal to or larger than the overall change rate;processing of deciding the opening ratio of the first area to be fully open, based on a determination that the first individual change rate is smaller than the overall change rate;processing of deciding the opening ratio of the first area to be a predetermined opening ratio smaller than fully open, based on a determination that the first individual change rate is equal to or larger than the overall changerate;processing of deciding the opening ratio of the second area to be fully open, based on a determination that the second individual change rate is smaller than the overall change rate; andprocessing of deciding the opening ratio of the second area to be the predetermined opening ratio, based on a determination that the second individual change rate is equal to or larger than the overall change rate.

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